Solar cell series connection (CB20479E)

In the figure we have the way to connect solar cells in series in order to increase their voltage. The cells must be of the same type.

Pulse Scrambler (CB20547E)
This circuit assumes that a pulse produced by S1 has a constant duration determined by R1 and C1....
Audio Preamplifier (CB957E)
This circuit is a from publication 1980, but still can be mounted with BC548 transistors for Q1...
Power Amplifier Stage (CB3833E)
This audio stage can be used in siren circuits, sound effects and others to excite a few watts...